From: John Reiser <jreiser@BitWagon.com>
To: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Paul Mundt <lethal@linux-sh.org>, Andi Kleen <ak@suse.de>,
Ingo Molnar <mingo@elte.hu>,
Arjan van de Ven <arjan@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: + fully-honor-vdso_enabled.patch added to -mm tree
Date: Fri, 02 Mar 2007 13:19:54 -0800 [thread overview]
Message-ID: <45E894FA.2040103@BitWagon.com> (raw)
In-Reply-To: <20070302193219.GA87@tv-sign.ru>
Oleg Nesterov wrote:
> Still, I don't understand why we don't pass NEW_AUX_ENT(AT_SYSINFO) when
> vdso_enabled == 0. We don't need linux-gate.so to use __kernel_vsyscall,
> we have FIX_VDSO. In that case we should s/PAGE_KERNEL_RO/PAGE_READONLY/
> of course. I guess the reason is some magic in glibc.
In the past there were problems where user code could not single-step
(or even read the code of) such system calls. Can these two operations
be performed today with what you propose, particularly if FIX_VDSO is
near 0xfffff000 ?
--
John Reiser, jreiser@BitWagon.com
next prev parent reply other threads:[~2007-03-02 21:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-01 17:52 + fully-honor-vdso_enabled.patch added to -mm tree Oleg Nesterov
2007-03-02 3:48 ` Paul Mundt
2007-03-02 19:32 ` Oleg Nesterov
2007-03-02 21:19 ` John Reiser [this message]
2007-03-03 17:38 ` Oleg Nesterov
2007-03-02 21:06 ` John Reiser
2007-03-02 22:18 ` Oleg Nesterov
2007-03-05 10:12 ` Paul Mundt
2007-03-05 10:54 ` Oleg Nesterov
2007-03-05 10:56 ` Paul Mundt
2007-03-02 22:19 ` Chuck Ebbert
2007-03-02 23:11 ` Oleg Nesterov
2007-03-02 23:33 ` John Reiser
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